CN110022982A - Electrostatic particle filtering - Google Patents
Electrostatic particle filtering Download PDFInfo
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- CN110022982A CN110022982A CN201780074474.2A CN201780074474A CN110022982A CN 110022982 A CN110022982 A CN 110022982A CN 201780074474 A CN201780074474 A CN 201780074474A CN 110022982 A CN110022982 A CN 110022982A
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- 239000002245 particle Substances 0.000 title claims abstract description 85
- 238000001914 filtration Methods 0.000 title claims description 10
- 230000001376 precipitating effect Effects 0.000 claims abstract description 36
- 238000004140 cleaning Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 6
- 238000004590 computer program Methods 0.000 claims 3
- 230000000694 effects Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 2
- 238000001556 precipitation Methods 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 8
- 238000000151 deposition Methods 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000004887 air purification Methods 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 241000282485 Vulpes vulpes Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 229910001423 beryllium ion Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004851 dishwashing Methods 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000803 paradoxical effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
- B03C3/368—Controlling flow of gases or vapour by other than static mechanical means, e.g. internal ventilator or recycler
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/14—Details of magnetic or electrostatic separation the gas being moved electro-kinetically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/24—Details of magnetic or electrostatic separation for measuring or calculating parameters, efficiency, etc.
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/32—Checking the quality of the result or the well-functioning of the device
Abstract
A kind of electrostatic air cleaning equipment, comprising: particle charging section；Particle precipitating phase；Current sensor is used to measure the electric current for the electrode plate for flowing through precipitating phase；And relative humidity sensor.It is applied to the voltage of electrode plate and is controlled by the air stream of equipment according to the measurement electric current for flowing through electrode plate.In this way, offer control is more to prevent precipitating phase internal electrical losses from flowing through, certain risk may cause, and optimize energy efficiency of the cleaning equipment relative to its purifying property.Relative humidity information also allows for the state of the reason of diagnosing high leakage current and precipitating phase, amount of the state in relation to wherein precipitating particle.
Description
Technical field
The present invention relates to electrostatic particle filtered air purification method and device are filtered and used for electrostatic particle.
Background technique
Static air (or other gases) cleaning equipment is well-known.This equipment is for example, by using by corona discharge side
The charging and collection for the particle (such as dust) that method ion acceleration generated and gas/air carry.
Corona discharge device applies high voltage potential between electric discharge (corona) electrode and collection (or acceleration) electrode to produce
Raw high field, and corona discharge is generated near discharge electrode.This is by adsorbing the corona on the particle that air carries
The ion of generation charges to execute particle.The collision between ion and ambient gas molecule generated by corona also can be by ion
Momentum passes to gas, so as to cause the corresponding sports of air, to realize entirety fortune of the air along desired air-flow direction
It is dynamic.Fan can be also used for further controlling the air stream by equipment.
After particle charging, charged particle is deposited on one group of passive electrode from air.Passive electrode and a group precipitation
Electrode is formed together parallel-plate structure, wherein each passive electrode plate is located in parallel between two precipitation electrodes plates, thus
The controlled spacing between adjacent panels is maintained, which is used as air duct.Because compared with using mechanical fiber filter,
Particle is captured from air to be realized with lower energy consumption, so equipment design is popular.This is because working as
Caused air-pressure drop is lower when air passes through the straight channel between the parallel-plate in electrostatic particle filter.Moreover, when parallel
When hardened structure includes the particle largely captured, parallel-plate structure easily can be cleaned or be washed by hand in dish-washing machine and wash, because
This regeneration.Fabric filter is not easy to regenerate, it is necessary to abandon as waste.
Particle charging section is located at the upstream of parallel-plate structure.Wherein by high voltage air ionization, usually by being related to
Thin corona wire (thin corona wires) charges to complete particle.Discharge ion from corona wire passes through charging at them
It is adsorbed on during section on the particle of air carrying, to charge to particle.It then, can be by means of in downstream parallel-plate section
In adjacent panels between the electrostatic field established precipitate charged particle.
The problem of parallel-plate filtration device structure, is to be likely to occur significant leakage current between the adjacent panels in precipitating phase
Ileak.With the increase of the increase of the grain amount captured in precipitating phase and relative humidity (RH) level, leakage current also increases.Electric leakage
A part of stream is DC leakage current, when these surfaces are covered by granular deposit, between DC leakage current flows through between precipitation plate
The surface of parting.These deposits serve as the conductive path between adjacent panels, and between these conductive paths, there are electric fields.?
What is known is that the smoke from cigarette particle deposited forms this conductive path, and conductive path increases, the increase of RH with the increase of RH
It is since the amount of the moisture absorbed in granular deposit then increases.
Another part of leakage current is peak current (spiky current), from the gap crossed between adjacent panels
Inverse corona (back-corona) electric discharge.These also tend to the amount of the granular deposit in increase and collector plate with RH
Increase and increase.
In the case where the high particulate load of high RH level and/or filter is horizontal, leakage current can exceed that the capacity of high voltage power supply.
In general, ensuring that leakage current is no more than the maximum value of setting by means of current-limiting circuit design.However, it means that between adjacent panels
Electric field is adjusted to reduced levels therewith.Under constant flow rate, it reduce integral particle filter efficiency η (dp), therefore reduce
Clean air delivery rate (CADR), to also reduce pipeline utilization factors.
It is then desired to a kind of electrostatic particle filter, even if when the leakage current in particle precipitate phase increases,
Allow for energy-efficient operation.
US 2014/0345463 discloses a kind of electrostatic precipitation device, and wherein current sensor is for detecting paradoxical discharge
Electric current, and this can be used for pass hull closure or the electric pressing operation in reduction.US 2008/0041138 discloses a kind of air
Contaminant sensor may include electrostatic filter, which includes end-of-filter lifetime detection.
Summary of the invention
The present invention is defined by the claims.
According to an aspect of the present invention, a kind of electrostatic air cleaning equipment is provided comprising:
Particle charging section；
Particle precipitating phase comprising parallel electrode plate；
Potential source is used to apply voltage between the adjacent electrode plates in precipitating phase；
Current sensor is used to measure the electric current for flowing through electrode plate；
Relative humidity sensor；
Stream controller；And
Device controller,
Wherein device controller is suitable for controlling potential source and stream controller according to the measured electric current for flowing through electrode plate,
Wherein device controller is suitable for:
When the measured electric current for flowing through electrode plate is lower than current threshold, implement the first normal manipulation mode；And
When the measured electric current for flowing through electrode plate is higher than current threshold and potential source and stream controller are controlled to drop
Low current and measured electric current are confirmed as by high relative humidity and when causing, and implement second mode；And
When the measured electric current for flowing through electrode plate is higher than current threshold, and potential source and stream controller are controlled to drop
When low current and measured electric current are confirmed as depositing particle deposition level in section by particle and causing, implement third mould
Formula, wherein controller is adapted to provide for output information (38) as output signal, and output signal instruction needs in the third mode
Cleaning or replacement precipitating phase.
The equipment considers to flow through the electric currents of precipitation electrodes to control electrostatic air cleaning process, and it also contemplate it is logical
Cross the main relative humidity (prevailing relative humidity) of the air of air cleaning facility.Electric current is electric leakage
Stream, and it indicates the particle gathered on precipitating plate electrode and on the surface of spacer, and these spacers are in adjacent electrode
Fixed range is maintained between plate.Control is applied to the voltage between adjacent electrode plates, and to limit leakage current, and this prevents electricity
The danger situation of source (that is, potential source) damage and such as fire etc.It is also possible to hear generated short circuit, and short circuit is also
There may be smells.
By additionally controlling air stream, it can also prevent the power consumption for the air of per unit volume being cleaned from declining
It is too low.Air stream is controlled in view of being applied to the voltage of precipitation electrodes plate.By monitoring the phase in the air handled by equipment
To humidity, it can determine whether high leakage current is mainly caused by high relative humidity or the particle accumulated on precipitation electrodes.In this way,
The reason of high leakage current can also be diagnosed to be.In the case where high particle accumulation, output is provided to indicate that precipitating phase needs to clean
Or replacement.
In more detail, when the measured electric current for flowing through electrode plate is lower than current threshold, device controller may be adapted to
Implement the first control model, wherein applying maximum electrical potential and stream controller implementation between adjacent electrode plates by equipment user institute
The flow velocity of selection.
When leakage current is lower than threshold value, this is normal manipulation mode, it is meant that equipment works normally.
When the relative humidity sensed is more than humidity threshold and the measured electric current for flowing through electrode plate is more than current threshold
When value, device controller may be adapted to implement the second control model, wherein the potential being applied between adjacent electrode plates is reduced,
Until it is measured flow through the current reduction to current threshold of electrode plate until, and stream controller implements flow velocity reduction, until
Until filter efficiency reaches efficiency threshold.
This is operation mode when high leakage current occurs, at least partly the reason is that relative humidity is high.Reduction is applied to adjacent
Voltage between electrode plate, to control and limit leakage current, and coutroi velocity, to ensure that equipment is net with satisfactory air
Change efficiency operation, thereby, it is ensured that satisfactory pipeline utilization factors.
When the relative humidity sensed is lower than humidity threshold and the measured electric current for flowing through electrode is more than current threshold
When, device controller may be adapted to implement third control model, wherein reducing the potential being applied between adjacent electrode plates, directly
To it is measured flow through the current reduction to current threshold of electrode plate until, and stream controller implements flow velocity reduction, until mistake
Until filter efficiency reaches efficiency threshold.
This is operation mode when high leakage current occurs, but reason is not relative humidity height.Reduction is applied to adjacent again
Voltage between electrode plate to control leakage current, and goes back coutroi velocity, to ensure that equipment is grasped with satisfactory filter efficiency
Make.However, the mode also indicates that the particle for existing in filter and largely precipitating.
Therefore, device controller may be adapted to provide output signal in a third mode, and output signal instruction needs clear
Clean or replacement precipitating phase.
Example according to another aspect of the present invention provides a kind of electrostatic air cleaning method, comprising:
It is charged using the particle that charging section carries the air in air stream；
Air stream is filtered using particle precipitating phase, which includes parallel with voltage between adjacent electrode plates
Electrode plate；
The electric current of electrode plate is flowed through in measurement；
Sense relative humidity；And
The voltage between adjacent electrode plates is controlled,
Wherein device controller:
When the measured electric current for flowing through electrode plate is lower than current threshold, implement the first normal manipulation mode；And
When the measured electric current for flowing through electrode plate is higher than current threshold and potential source and stream controller are controlled to drop
Low current and measured electric current are confirmed as by high relative humidity and when causing, and implement second mode；And
When the measured electric current for flowing through electrode plate is higher than current threshold, and potential source and stream controller are controlled to drop
When low current and measured electric current are confirmed as depositing particle deposition level in section by particle and causing, implement third mould
Formula, wherein controller provides output information (38) and is used as output signal in the third mode, output signal instruction needs to clean
Or replacement precipitating phase.
This is the method implemented by equipment defined above.
When the measured electric current for flowing through electrode plate is lower than current threshold, it is possible to implement the first control model, wherein
Apply maximum electrical potential between adjacent electrode plates, and stream controller implements the selected flow velocity of user by equipment.
When the relative humidity sensed is more than humidity threshold and the measured electric current for flowing through electrode plate is more than current threshold
When value, it is possible to implement the second control model, wherein the potential being applied between adjacent electrode plates is reduced, until measured is flowed through
Until the current reduction to current threshold of electrode, and stream controller implements flow velocity reduction, until filter efficiency reaches efficiency threshold
Until value.
When the relative humidity sensed is lower than humidity threshold and the measured electric current for flowing through electrode is more than current threshold
When, it is possible to implement third control model, wherein the potential being applied between adjacent electrode plates is reduced, until measured flows through electricity
Until the current reduction to current threshold of pole plate, and stream controller implements flow velocity reduction, until filter efficiency reaches efficiency threshold
Until value.
The efficiency threshold used in second mode and the third mode is imitated for example including the classified filtering of particular particle size
Rate.Particular particle size is, for example, the particle diameter of 200nm, and classified filtering efficiency threshold is, for example, 0.9.
Stream controller can be fan.Alternatively, however, stream can be ion wind.In this case, stream controller can
It is suitable for controlling the corona current in charging section, changes to implement stream.
Control method can be at least partly implemented in software.
Detailed description of the invention
Now, example of the invention is described in detail with reference to attached drawing, in which:
Fig. 1 shows electrostatic particle deposition filter；
Fig. 2 shows the air cleaning facilities for the filter for using Fig. 1；And
Fig. 3 shows air purification method.
Specific embodiment
The present invention provides a kind of electrostatic air cleaning equipment comprising particle charging section；Particle precipitating phase；Current sense
Device is used to measure the electric current for the electrode plate for flowing through precipitating phase；And relative humidity sensor.Be applied to electrode plate voltage and
It is controlled by the stream of equipment according to the measurement electric current for flowing through electrode plate.In this way, it is excessive to prevent leak-stopping electric current to provide control.Relatively
Humidity information also allows for the state of the reason of diagnosing high leakage current and precipitating phase, and the state is related wherein to precipitate particle
Amount.
Fig. 1 shows the basic structure of electrostatic particle filter.
There are particle charging sections 10, receive contaminated with air stream rate φ.Particle precipitating phase 12 includes parallel
The array of plate 14 is held in place by the electrical isolation spacer 16 of spacer array.Plate includes alternate precipitation electrodes
And passive electrode.
The length of plate 14 is LplateAnd d is divided between plateplate, which is maintained by spacer array.From precipitating phase 12
Export purified air stream.Power supply 18 for precipitating phase includes voltage source, which applies between each pair of adjacent panels 14
Making alive Vplate.Therefore, one group of alternating plate earthing, and another group is in potential Vplate.One group is precipitation electrodes, and another group
It is passive electrode.
In this way, charged particle is deposited on passive electrode plate by electrostatic field:
Eplate=Vplate/dplate
This establishes between the adjacent panels 14 in the array in the parallel-plate section of downstream.In this way, parallel-plate section is used as particle
Precipitating phase.
The design value of particle precipitating phase and technological parameter therein be such as in the household individual air cleaners typically encountered
Under:
3mm≤dplate≤10mm,
3kV≤Vplate≤10kV,
0.5kV/mm≤Eplate≤1.0kV/mm,
0.5m/s≤vair≤1.5m/s(vairIt is the average air speed between adjacent electrode plates),
30mm≤Lplate≤150mm(LplateIt is length of the electrode plate along airflow direction),
150mm≤Hplate≤400mm(HplateIt is height of the electrode plate along the direction perpendicular to airflow direction),
According to design value referred to above and the volumes of air flow velocity rate φ that is purified by cleaning equipment is needed, in precipitating phase
The number of electrode plate can be more than 100.
Under laminar flow condition between electrode plate, about using n (dp) elementary charge charging, diameter dpParticle point
Grade filter efficiency η (dp) (fractional filtration efficiency) be given by:
IfThen
IfThen η (dp)=1
vavAverage air speed between display plate, and it is directly proportional to flow velocity φ under the fixed dimension of precipitating phase；
μairIt is air viscosity (at room temperature, μair=1.8 × 10-5Pa.s)；
" e " is elementary charge (e=1.6 × 10-19C)；
Cc(dp) it is Cunningham sliding modifying factor.For it to particle diameter dpDependence, reference
Book " Aerosol Technology:Properties, the Behavior andMeasurement of of W.C.Hinds
The 3rd chapter in the Airborne Particles " second edition (John Wiley and Sons).
Generated by the ionic adsorption in corona discharge, diameter dpParticle on elementary charge number n (dp) typical mean
Value (depending on the intensity of corona discharge current to a certain extent) is as follows:
For dp=80nm, n ≈ 2-3,
For dp=200nm, n ≈ 5-6.
With reference to the 109-123 pages of the Journal of Aerosol Science 16 (1985) of Adachi et al., wherein
Particle charging is predicted on the basis of Fuchs particle charge theory, and passes through experimental verification.
From filtration art (see above cited book " Aerosol Technology:Properties,
The 9th chapter in Behavior and Measurement of Airborne Particles ") from the point of view of, it is well known that for straight
Diameter is close to for the particle size of 200nm, η (dp) reach minimum value, i.e. η (dp)=ηmin.It is commonly designed and operates electro static filtering
Device, so that for dp~200nm, ηmin≥ηset, wherein ηset≥0.9.For example, work as vair=1m/s, dplate=4mm and
Eplate=Vplate/dplateWhen=1kV/mm, the latter's efficiency approximation is in LplateIt is realized at=100mm.
As explained above, the problem of parallel-plate filtration device structure, is to go out between the adjacent panels in precipitating phase
Now significant leakage current Ileak.In the case where the high particulate load of high relative humidity level and/or filter is horizontal, IleakCan be more than
The capacity of power supply 18.Usually, it is ensured that IleakNo more than the maximum value I of settingleak,max, however means that the electricity between adjacent panels
Field EplateIt to be adjusted to reduced levels therewith, which reduce integral particle filter efficiency η (dp)。
The present invention is based in response to the feedback from controller come controlling filter operation and/or air purifier operate,
The controller receives the data about envionmental humidity and level of drain current.In addition, it can also issue the user with warning with
Cleaning or replacement filter.
In range as described above, the structure of Fig. 1 is known.For making the ozone generated in particle charging section most
Few reason is, it is preferable to use positive electricity corona voltage carries out particle charging, to generate positive particle charge.When by adjacent precipitation electrodes plate
When being connected to reference (zero or ground) potential, these positively charged particles can be from being deposited on passive electrode plate in air, the receipts
Collector plate is connected to negative voltage Vplate.Alternatively, when passive electrode plate is connected to zero or earth potential, precipitation electrodes plate can be with
It is connected to positive voltage Vplate。
It in order to realize method of the invention, adds and electric leakage flowmeter 20 is provided, measurement passes through electrode plate to the leakage current on ground.
To which galvanometer 20 to be attached to one group of electrode plate for being connected to zero or earth potential.By via galvanometer that whole group all zero is electric
Position electrode plate is connected to zero or earth potential, measures the combined leakage currents I on groundleak.Galvanometer can be implemented as simply as electric current
Sense resistor, wherein the voltage at measuring resistor both ends, is then used as the input of controller.Galvanometer 20 preferably makes
Obtain the possible current spike that can be measured DC electric current baseline value and can be superposed thereon.Then, in period T, from
The average drain currents I of measurement is obtained by the total mark charge Q of galvanometerleak, that is, Ileak=Q/T.Preferably, T >=10s and
IleakIt can be confirmed as the moving average of the charge of measurement at any time in time course.
Fig. 2 shows whole systems, can be considered as air cleaning facility.It includes air cleaning section 30 comprising
The electrostatic air filter 30a of Fig. 1, electrostatic air filter 30a include electric leakage flowmeter；And fan 30b.
Fan 30b is used as stream controller.Alternatively, which can be operated based on ion wind air stream.In this feelings
Under condition, charging section 10 also serves as stream controller.
Additionally, there are relative humidity meters 32 and controller 34.Controller receives the relative humidity level from sensor 32
RH and plate voltage V from air cleaning section 30plate, leakage current IleakWith air stream rate φ.
Feedback path 36 makes it possible to adjust VplateWith the setting of φ, and makes it possible to provide suitable display state and disappear
Breath.In air stream situation as caused by ion wind, by control fan speed or pass through the corona current in control charging section
Carry out coutroi velocity.Because air stream caused by ion wind can only the both ends of air cleaning facility generate very small pressure drop (≤
1Pa), so when using the relatively small air cleaning facility of size to handle upper air current rate (> 150m3/ hour) when, it is best
Use fan.
Controller realizes the control method of a variety of different control settings of wherein application.
If at any RH,
Ileak<Ileak,max
Then
Vplate=Vplate,max
And
φ≤φmax(also according to manual setting)
If leakage current is lower than maximum set value Ileak,max, then it is arranged using the control, determines the performance of particulate filter
Best and input power level use is best.Preferably, V is selectedplate,maxTo be generated between adjacent electrode plates
0.5kV/mm≤Eplate,max=Vplate,max/dplateMaximum field intensity in the range of≤1.0kV/mm.
If in RH > RHset, Ileak≥ILeak, max,
Then
Reduce Vplate, until Ileak=Ileak,maxUntil,
And
φ is reduced simultaneously, until η (dp)=ηset(for dp~200nm) until.
When there are high relative humidity and higher than the horizontal I of maximum leakage currentleak,maxVplate=Vplate,maxUnder electric leakage
When stream, it is arranged using the control.Now, to filter (plate voltage Vplate) and air purifier air stream (φ) operation setting
It is adjusted, to cope with high envionmental humidity, to optimize pipeline utilization factors.Preferably, horizontal RH is setset>=70%.
In RH >=70%, especially in RH >=90%, separate on (by particle contamination) surface of the spacer structures of plate electrode
Moisture absorption be likely to be breached such degree so that it forms conductive path between the plates, so that even if only capturing on collecting board
Suitable particle, also can be in Vplate,maxLower generation is more than Ileak,maxLeakage current.For example, just deposited smoke from cigarette
Highly hygroscopic degree of the grain when it is in RH >=70% due to, is especially famous, and when air cleaning facility handles contaminated humid air
When, they can cause significant leakage current.Plate voltage is reduced, until leakage current is reduced to maximum value.In addition, reducing air
Stream, until reaching desired efficiency.
If in RH≤RHset, Ileak≥Ileak,maxWhen,
Then
Reduce Vplate, until Ileak=Ileak,maxUntil,
And
φ is reduced simultaneously, until η (dp)=ηsetUntil (for dp~200nm).
When not having high relative humidity but leakage current is higher than maximum horizontal, it is arranged using the control.To filter (plate voltage
Vplate) and the operation setting of air purifier (air stream φ) adjusted again with response environment relative humidity, to optimize
Pipeline utilization factors.In this case, high leakage current mainly by the high particulate load degree of filter rather than humidity level causes,
Therefore display alert message " recommended replacement filter " or " it is recommended that cleaning filter ".In Fig. 2, this is shown as controller 34
Output 38.Filter load has a large amount of deposited particles, even if being lower than given threshold RHsetRh value under, this also can
Cause high leakage current value.
In Ileak≤Ileak,maxLower VplateWhen value reduces, clean air delivery rate (CADR) is reduced, and can only pass through
φ is reduced to maintain high power to utilize the factor.When the particulate load of filter increases, VplateBecome more with reduction needed for φ
Add serious, and if replacement/cleaning without filter, eventually causes under any relative humidity level
Unacceptable filter capability.
Fig. 3 shows electrostatic air cleaning method.
In step 40, it is charged using charging section to the particle that the air in air stream carries.
In step 42, air stream is filtered using particle precipitating phase, which includes having between adjacent electrode plates
There is the parallel electrode plate of voltage.
In step 44, the electric current of electrode plate is flowed through in measurement.
In step 46, near air purifier, for example, sensing relative humidity at air intake.
In step 48, according to the measured electric current for flowing through electrode plate and the relative humidity sensed, adjacent electricity is controlled
Voltage between pole plate and control air stream.
An operation mode in operation mode as discussed above is realized in the control of step 48.
As discussed above, embodiment utilizes controller.Controller can be real in many ways with software and/or hardware
It is existing, to execute required various functions.Processor is an example of controller, and the controller is using one or more micro processs
Software (for example, microcode) can be used to be programmed to carry out required function in device, the microprocessor.However, controller can be with
It is realized with or without processor, and is also implemented as executing the specialized hardware and processor of certain functions
The combination of (for example, microprocessor and interlock circuit of one or more programmings) is to execute other function.
It can include but is not limited to conventional micro- place in the example of the various controller assemblies used in the examples of the disclosure
Manage device, specific integrated circuit (ASIC) and field programmable gate array (FPGA).
In various implementations, processor or controller can be with such as volatile and non-volatile computer storages
One or more storage mediums of (such as RAM, PROM, EPROM and EEPROM) etc are associated.Storage medium can use one
Or multiple program codings, the one or more program in one or more processors and/or controller when executing, with required
Function execute.Various storage mediums can be fixed in processor or controller, or can be it is transmittable so that storage
One or more programs on it can be loaded into processor or controller.
Described above is the device and method how to prevent equipment from entering unacceptable mode of operation.However, of the invention
It also allows for by measuring leakage current IleakThe longevity is used with the residue for being predicted deposition filter by means of granule density sensing
Life.The particle sensor in particle sensor and home environment in air purifier can be used to execute granule density sense
It surveys.This provides the interested information for plant maintenance.The information can be used as " output information " offer, and can be with
Consider relative humidity level.
Electrostatic air cleaning equipment for extracting particulates emission (such as dust or pollutant) from air has numerous
And it is widely applied.Embodiments described above can be easily incorporated in biggish air cleaning member or equipment.It is quiet
Electric air cleaning facility can for example with one or more additional air cleaning facilities or filter (such as pneumatic filter)
Tandem compound.In this case, electrostatic air cleaning equipment is preferably rested in the upstream of one or more pneumatic filters,
To protect the latter from the influence of the granular deposit on activated filter film surface.Alternatively, one or more changes of the invention
Body embodiment can be with their own tandem compound, for example, having the suitably-arranged for extracting various sizes of particle matter
Embodiment.
By study attached drawing, disclosure and appended claims, those skilled in the art practice it is claimed
Other modifications of disclosed embodiment are understood that and realized when invention.In the claims, word " comprising " is not excluded for other
Element or step, and indefinite article "a" or "an" be not excluded for it is multiple.It states in mutually different dependent claims
The combination that only fact is not offered as these measures of certain measures cannot be used for benefiting.Any appended drawing reference in claim
It is not necessarily to be construed as limitation range.
Claims (13)
1. a kind of electrostatic air cleaning equipment, comprising:
Particle charging section (10)；
Particle precipitating phase (12), including parallel electrode plate (14)；
Potential source (18), for applying voltage between the adjacent electrode plates in the precipitating phase；
Current sensor (20), for measuring the electric current for flowing through the electrode plate；
Relative humidity sensor (32)；
Stream controller (30a)；And
Device controller (34),
Wherein the device controller (34) is suitable for controlling the potential according to the measured electric current for flowing through the electrode plate
Source and the stream controller, wherein the device controller is suitable for:
When the measured electric current for flowing through the electrode plate is lower than current threshold, implement the first normal manipulation mode；And
When the measured electric current for flowing through the electrode plate is higher than the current threshold and the potential source and the flow control
Device is controlled to reduce the electric current and measured electric current is confirmed as by high relative humidity and when causing, and implements second
Mode；And
When the measured electric current for flowing through the electrode plate is higher than the current threshold and the potential source and the flow control
Device is controlled to reduce the electric current and measured electric current is confirmed as by the particle connate water in the particle precipitating phase
When putting down and causing, implement the third mode, wherein the controller is adapted to provide for output information (38) work in the third mode
For output signal, the output signal instruction needs to clean or replace the precipitating phase.
2. equipment according to claim 1, wherein the device controller (34) is suitable for: by the adjacent electrode plates
Between apply maximum electrical potential and implement first control model, and the stream controller is suitable for: implementing by the equipment
The selected flow velocity of user.
3. equipment according to claim 1 or 2, wherein the device controller (34) is suitable for: relatively wet what is sensed
When degree is more than humidity threshold, implement second control model, and the device controller is suitable for: reduction is applied in described
Potential between adjacent electrode plates, until the measured current reduction for flowing through the electrode plate to the current threshold,
And the stream controller is suitable for: implementing flow velocity reduction, until filter efficiency reaches efficiency threshold.
4. equipment according to any one of the preceding claims, wherein the device controller (34) is suitable for: when being sensed
Relative humidity when being lower than humidity threshold, implement third control model, and the device controller is suitable for: reduction is applied in
The potential between the adjacent electrode plates, until the measured current reduction for flowing through the electrode plate to the current threshold
Until value, and the stream controller is suitable for: implementing flow velocity reduction, until filter efficiency reaches efficiency threshold.
5. equipment according to claim 3 or 4, wherein efficiency threshold includes the classified filtering effect for particular particle size
Rate.
6. equipment according to claim 5, wherein the particular particle size is 200nm particle diameter, and the effect
Rate threshold value is 0.9.
7. equipment according to any one of the preceding claims, wherein the stream controller (30b) is fan.
8. a kind of electrostatic air cleaning method, comprising:
(40) it is charged using the particle that air of the charging section to air stream carries；
(42) air stream is filtered using particle precipitating phase, the particle precipitating phase includes having voltage between adjacent electrode plates
Parallel electrode plate；
(44) electric current of the electrode plate is flowed through in measurement；
(46) relative humidity is sensed；And
(48) voltage between adjacent electrode plates is controlled according to the measured electric current for flowing through the electrode plate and is controlled
The air stream is made,
The wherein device controller:
When the measured electric current for flowing through the electrode plate is lower than current threshold, implement the first normal manipulation mode；And
When the measured electric current for flowing through the electrode plate is higher than the current threshold and the potential source and the flow control
Device is controlled to reduce the electric current and measured electric current is confirmed as by high relative humidity and when causing, and implements second
Mode；And
When the measured electric current for flowing through the electrode plate is higher than the current threshold and the potential source and the flow control
Device is controlled to reduce the electric current and measured electric current is confirmed as by the particle connate water in the particle precipitating phase
When putting down and causing, implement the third mode, wherein the controller provides output information (38) as defeated in the third mode
Signal out, the output signal instruction need to clean or replace the precipitating phase.
9. according to the method described in claim 8, including: to be implemented by applying maximum electrical potential between the adjacent electrode plates
First control model, and the stream controller implements the selected flow velocity of user by the equipment.
10. method according to claim 8 or claim 9, comprising: when the relative humidity sensed is more than humidity threshold, and
By reducing the potential between the adjacent electrode plates, until the measured current reduction for flowing through the electrode plate to the electricity
Until flowing threshold value, to implement second control model；And implement flow velocity reduction, it is until filter efficiency reaches efficiency threshold
Only.
11. according to method described in claim 8,9 or 10, comprising: when the relative humidity sensed is lower than humidity threshold, and
And by reducing the potential being applied between the adjacent electrode plates, until the measured electric current drop for flowing through the electrode plate
Until as low as the current threshold, to implement the third control model；And implement flow velocity reduction, until filter efficiency reaches
Until efficiency threshold.
12. method described in 0 or 11 according to claim 1, wherein the efficiency threshold includes point for particular particle size
Grade filter efficiency, the particular particle size is, for example, 200nm particle diameter, and the efficiency threshold is 0.9.
13. a kind of computer program, including computer program code means, when described program is run on computers, institute
It states computer program code means and is adapted for carrying out the method according to any one of claim 8 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310937577.4A CN116727105A (en) | 2016-12-01 | 2017-12-01 | Electrostatic particle filtration |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP16201686 | 2016-12-01 | ||
| EP16201686.9 | 2016-12-01 | ||
| PCT/EP2017/081275 WO2018100197A1 (en) | 2016-12-01 | 2017-12-01 | Electrostatic particle filtering |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310937577.4A Division CN116727105A (en) | 2016-12-01 | 2017-12-01 | Electrostatic particle filtration |
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| Publication Number | Publication Date |
|---|---|
| CN110022982A true CN110022982A (en) | 2019-07-16 |
Family
ID=57471696
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|---|---|---|---|
| CN201780074474.2A Pending CN110022982A (en) | 2016-12-01 | 2017-12-01 | Electrostatic particle filtering |
| CN202310937577.4A Pending CN116727105A (en) | 2016-12-01 | 2017-12-01 | Electrostatic particle filtration |
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|---|---|
| US (1) | US11413628B2 (en) |
| EP (1) | EP3548183B1 (en) |
| JP (1) | JP7199353B2 (en) |
| CN (2) | CN110022982A (en) |
| WO (1) | WO2018100197A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109579145A (en) * | 2018-11-28 | 2019-04-05 | 云森威尔智能环境（深圳）有限公司 | A kind of novel fresh wind air conditioner indoor unit |
| CN113513823A (en) * | 2021-03-22 | 2021-10-19 | 珠海格力电器股份有限公司 | Control device and method for fresh air filter unit and fresh air filter unit |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3444535A1 (en) | 2017-08-15 | 2019-02-20 | Koninklijke Philips N.V. | Ventilation unit, system and method |
| CN111715010A (en) * | 2019-03-21 | 2020-09-29 | 北京康孚科技股份有限公司 | Axial flow cyclone coagulation type air filtering method and device |
| US11293993B2 (en) * | 2019-09-04 | 2022-04-05 | Applied Materials Israel Ltd. | Detection of an electric arc hazard related to a wafer |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3548183B1 (en) | 2022-03-30 |
| JP2019536624A (en) | 2019-12-19 |
| WO2018100197A1 (en) | 2018-06-07 |
| US20190381516A1 (en) | 2019-12-19 |
| CN116727105A (en) | 2023-09-12 |
| US11413628B2 (en) | 2022-08-16 |
| JP7199353B2 (en) | 2023-01-05 |
| EP3548183A1 (en) | 2019-10-09 |
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